I use \\n to create a linebreak in web tooltip. This works in IE and in Chrome. But Firefox ignores it.
What will work universally as linebreak character in tooltip?
Firefox doesn't display multi-lines in tooltips.
Use tooltip script if you really want to customize it as you expected. http://www.hongkiat.com/blog/tooltips-scripts-50-scripts-with-ajax-javascripts-css-tutorials/